Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Install memory in an iMac - Apple Support
What Does It Take To Upgrade a 2012 iMac 21.5"?
The Case of the Late-2012 iMacs - MacStories
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Apple iMac Late 2012 21.5-inch 3.1 GHz Core i7 Desktop DDR3 RAM Memory | Kingston
Late 2012 iMac becomes vintage/obsolete this month, but is eligible for pilot repair scheme - 9to5Mac
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
How to Upgrade/Install Memory in a 21.5-inch iMac (Mid 2017) iMac18,1 iMac18,2 - YouTube
iMac Intel 21.5" EMC 2544 Repair - iFixit
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
How to upgrade RAM iMac late 2013 21.5inch - break & fix MOVIE - YouTube